Hydrothermal alteration of tourmaline from tourmalinites in the Krkonoše Crystalline Unit, Bohemian Massif, Czech Republic

This abstract deals with the hydrothermal alteration of the tourmaline from tourmalinites in the Krkonose Crystalline Unit, Bohemian Massif investigated by electron microprobe. Tourmaline from tourmalinite layers has undergone metasomatic replacement reactions in some cases. They include: a) replacement of early tourmaline by newly formed schorl - dravite (type iii), muscovite and quartz; b) replacement of schorl - dravite (type ii and iii) by chlorite and muscovite.